短語(yǔ)詞組短語(yǔ)polar night vortex 極夜渦旋polar stratospheric vortex [地物]平流層極地渦旋breakdown of polar vortex 崩潰過(guò)程polar vortex index 極渦指數(shù)the polar vortex 極渦intensity of polar vortex 極渦強(qiáng)度stratospheric polar vortex 平流層極渦north polar vortex 北極渦 返回 polar vortex